One of my FW's is a 1937, and has numbers on the tension dial, a chrome wheel and chrome bobbin winder. I haven't checked my other two, as they aren't out right now, but I know one is a '36 and I can't remember if the other one is a
'35 or '38. But I am sure they all have Chrome wheels., and if my memory serves me correctly these also have numbered dials for the tension. Possibly some changes made on that machine, and if so could be that the orig. parts were not found.